I am wiring a Dayton 3E367A unit heater for afriend. All the wiring has been disconnected in the junction box. Is there any way to find a schematic for this heater? I can't find one online and the heater is discontinued. There are 3 wires from the box into the heater and the box has a disc switch (2 poles - one for low voltage and another for line voltage). Any help would be appreciated.

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If I understand your post correctly....You state that you are hooking up a 240v heater and towards the end you speak of removing jumpers...W2 terminals..ect. It sounds to me your trying to us a 24v low voltage thermostat instead of a Line voltage thermostat.That's what I'd take a look at.

Look at the diagram here. It is actually called the neutral wire with a hot lead on each side. The new 4 wire dryer cords actually have a ground and a neutral. The neutral and the ground are usually hooked together or "bonded" in a breaker box. Heater draws 21 amps so you should be good to go.

Have you tried the flue vent? If not, an easy way to check this would be to take the vent pipe off of the unit and see if it continues to have the problem. In most cases, this happens when you have blocked return air or dirty filters, flue blocked, or induction is blocked from switch or housing. One other possibility would be a dirty/clogged a coil which isn't allowing sufficient air to push out causing the limit to trip. I hope this helps somewhat.

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Related Questions:

The problem could be the conduit.....
-disconnect the conduit and wires from water heater
-run wire into a junction box set lower than top of water heater... -then run another #10 wire from the junction box up to water heater...
-So if water is coming from conduit, it will accumulate into junction box and not in the water heater wiring cavity.

What in particular are you needing help with?This is a 208-230 VAC 1 or 3 phase strip heating unit that requires and external line voltage t-stat to control the temperature.They also include auto-reset thermal protection.

On the 40 amp breaker, you should be using 8-3 w/ground. 10-3 w/ground will work on the 30 amp breaker. 12-3 w/ground is used for 20 amp circuits. Your new heater should have the electrical requirements listed in the user/installation information.

The white is the common neutral, it is probably a 3 wire unit, and you are missing the ground wire. Check inside the control panel and see if someone wired it using the white wire for the ground, it will be screwed into a terminal lug. Check the schematics to see if the unit requires a common neutral to run the controls.